Matches in SemOpenAlex for { <https://semopenalex.org/work/W4210762650> ?p ?o ?g. }
- W4210762650 endingPage "145" @default.
- W4210762650 startingPage "129" @default.
- W4210762650 abstract "Land surface phenology (LSP) plays a critical role in the regulation of photosynthesis, evapotranspiration, and energy fluxes. Significant progress has been made in extracting LSP information over large areas using satellite data, yet LSP retrievals remain a challenge over vast arid and semi-arid ecosystems because of sparse greenness, high variability and the lack of distinct annual patterns; for example, the MODerate Imaging Spectrometer (MODIS) Land Cover Dynamics Product MCD12Q2 that provides LSP metrics globally often failed to provide LSP information in these ecosystems. In this study, we used a modified threshold algorithm to extract LSP timing metrics, including the start, peak, and end of growing seasons, using the 16-day composite Enhanced Vegetation Index (EVI) time series from MODIS data. We applied this regionally customized algorithm across all arid and semi-arid climate regions of Australia (75% of the continental land area) encompassing shrublands, grasslands, savannas, woodlands, and croplands, extracting LSP metrics annually from 2003 to 2018, with up to two (phenology) seasons accounted for in each year. Our algorithm yielded an average of 64.9% successful rate of retrieval (proportion of pixels with retrieved LSP metrics) across 16 years in Arid and Semi-arid AUStralia (AS-AUS), which was a significant increase compared to the 14.5% rate of retrieval yielded in our study area by the global product and the major cause of the different performances between these two approaches was the different EVI amplitude restrictions utilized to avoid spurious peaks (i.e. EVI amplitude ≥ 0.1 used by the global product and peak EVI ≥ time series average EVI used by our algorithm). Gross primary productivity (GPP) measurements at OzFlux eddy covariance (EC) tower sites were used to cross-compare with the presence/absence of growing seasons detected by our algorithm, and 97% of our retrieved seasons matched with those extracted using EC data. Preliminary tests at five OzFlux sites showed that our algorithm was robust to view angle-induced sensitivity of the input data and showed similar performance when using EVI data calculated using MODIS Nadir BRDF-Adjusted Reflectance product. Our retrieved LSP metrics revealed that vegetation growth in arid ecosystems is highly irregular and can occur at any time of the year, more than once in a year, or can skip a year. The proportion of pixels with two growing seasons was found to be correlated with the average annual precipitation of the study area (p < 0.01), providing an estimation approach of LSP via rainfall. Our study improves the detection and measurement of vegetation phenology in arid and semi-arid regions by improving the spatial extend of LSP retrievals, which contributes to studies on LSP variations and dryland ecosystem resilience to climate change. More evaluation is planned for future work to assess and further improve the accuracy of the retrieved LSP metrics." @default.
- W4210762650 created "2022-02-08" @default.
- W4210762650 creator A5003344495 @default.
- W4210762650 creator A5005934331 @default.
- W4210762650 creator A5006083049 @default.
- W4210762650 creator A5029626886 @default.
- W4210762650 creator A5031660975 @default.
- W4210762650 creator A5033905771 @default.
- W4210762650 creator A5044832347 @default.
- W4210762650 creator A5046078938 @default.
- W4210762650 creator A5046277669 @default.
- W4210762650 creator A5052730802 @default.
- W4210762650 creator A5060555720 @default.
- W4210762650 creator A5071260153 @default.
- W4210762650 creator A5075418773 @default.
- W4210762650 creator A5080556942 @default.
- W4210762650 date "2022-03-01" @default.
- W4210762650 modified "2023-10-16" @default.
- W4210762650 title "Land surface phenology retrievals for arid and semi-arid ecosystems" @default.
- W4210762650 cites W1853230889 @default.
- W4210762650 cites W1910050210 @default.
- W4210762650 cites W1967485217 @default.
- W4210762650 cites W1967755435 @default.
- W4210762650 cites W1977545093 @default.
- W4210762650 cites W1993901414 @default.
- W4210762650 cites W1996463620 @default.
- W4210762650 cites W1998702443 @default.
- W4210762650 cites W2007468519 @default.
- W4210762650 cites W2007621088 @default.
- W4210762650 cites W2018976735 @default.
- W4210762650 cites W2019652370 @default.
- W4210762650 cites W2024662065 @default.
- W4210762650 cites W2030688147 @default.
- W4210762650 cites W2035029697 @default.
- W4210762650 cites W2036627824 @default.
- W4210762650 cites W2042892802 @default.
- W4210762650 cites W2043039605 @default.
- W4210762650 cites W2055158641 @default.
- W4210762650 cites W2056301837 @default.
- W4210762650 cites W2058213690 @default.
- W4210762650 cites W2059196248 @default.
- W4210762650 cites W2060398476 @default.
- W4210762650 cites W2060940704 @default.
- W4210762650 cites W2063433400 @default.
- W4210762650 cites W2063923547 @default.
- W4210762650 cites W2072093516 @default.
- W4210762650 cites W2094529927 @default.
- W4210762650 cites W2096682311 @default.
- W4210762650 cites W2099191715 @default.
- W4210762650 cites W2099698780 @default.
- W4210762650 cites W2101779404 @default.
- W4210762650 cites W2102984889 @default.
- W4210762650 cites W2107888302 @default.
- W4210762650 cites W2109606373 @default.
- W4210762650 cites W2113410727 @default.
- W4210762650 cites W2115952782 @default.
- W4210762650 cites W2116078772 @default.
- W4210762650 cites W2125230412 @default.
- W4210762650 cites W2129331467 @default.
- W4210762650 cites W2138448722 @default.
- W4210762650 cites W2140944264 @default.
- W4210762650 cites W2142362272 @default.
- W4210762650 cites W2146243542 @default.
- W4210762650 cites W2196391350 @default.
- W4210762650 cites W2279160286 @default.
- W4210762650 cites W2290099754 @default.
- W4210762650 cites W2292232423 @default.
- W4210762650 cites W2338049369 @default.
- W4210762650 cites W2343787371 @default.
- W4210762650 cites W2347200045 @default.
- W4210762650 cites W2396672193 @default.
- W4210762650 cites W2401795785 @default.
- W4210762650 cites W2467753601 @default.
- W4210762650 cites W2519763546 @default.
- W4210762650 cites W2522055505 @default.
- W4210762650 cites W2528438884 @default.
- W4210762650 cites W2563488943 @default.
- W4210762650 cites W2592471618 @default.
- W4210762650 cites W2600735150 @default.
- W4210762650 cites W2609546815 @default.
- W4210762650 cites W2735223817 @default.
- W4210762650 cites W2793197903 @default.
- W4210762650 cites W2794421859 @default.
- W4210762650 cites W2796980406 @default.
- W4210762650 cites W2810876751 @default.
- W4210762650 cites W2844909617 @default.
- W4210762650 cites W2911995594 @default.
- W4210762650 cites W2927677668 @default.
- W4210762650 cites W2943471218 @default.
- W4210762650 cites W2950656391 @default.
- W4210762650 cites W2950891428 @default.
- W4210762650 cites W2969298904 @default.
- W4210762650 cites W2980990633 @default.
- W4210762650 cites W2990234147 @default.
- W4210762650 cites W2999347784 @default.
- W4210762650 cites W3004741759 @default.
- W4210762650 cites W3026341921 @default.
- W4210762650 cites W3039959470 @default.